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An Efficient Channel Estimation Scheme Using Walsh Pilots in Bi-directional Wireless OFDM Relay Systems with analog network coding

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IEICE TRANSACTIONS ON COMMUNICATIONS 2013年第8期E96B卷 2119-2130页

作者： Koshimizu, Yuta Okamoto, Eiji Nagoya Inst Technol Grad Sch Engn Dept Comp Sci & Engn Nagoya Aichi 4668555 Japan

In this paper, we propose an efficient channel estimation scheme in bi-directional wireless orthogonal frequency division multiplexing (OFDM) relay systems applying analog network coding (ANC). In the relay systems applying ANC, channel separation is needed to estimate each of the bi-directional channels simultaneously from the combined received signal. In the conventional channel estimation schemes, relatively higher-ratio pilots are needed to obtain accurate channels. In contrast, we propose a channel estimation scheme with sparse pilots, while maintaining high accuracy for channel estimation. In the proposed scheme, Walsh codes are inserted as the pilot symbols at both end nodes, and the individual channels are obtained by correlation processing from the combined signals. The improved bit error rate (BER) and throughput performances of the proposed scheme are shown through computer simulations.

关键词： channel estimation OFDM analog network coding Walsh code

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Performance of analog network coding with Asymmetric Traffic Requirements

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IEEE COMMUNICATIONS LETTERS 2011年第6期15卷 647-649页

作者： Upadhyay, Prabhat K. Prakriya, Shankar Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

In this letter, we evaluate the outage performance of analog network coding (ANC) protocol for a two-way half-duplex relaying system with asymmetric traffic requirements at end terminals. We derive a simple and generalized expression for overall system outage probability in a Rayleigh flat-fading environment. We also deduce the optimal relay location and power allocation in order to minimize the overall system outage. Numerical and simulation results highlight the effect of optimal relay positioning and power allocation under various traffic requirements.

关键词： analog network coding outage probability Rayleigh fading two-way relaying

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ANC-ALOHA: analog network coding ALOHA for Satellite networks

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IEEE COMMUNICATIONS LETTERS 2014年第6期18卷 957-960页

作者： Noh, Hong-Jun Lee, Jong-Kwan Lim, Jae-Sung Ajou Univ Dept Comp Engn Suwon 441749 South Korea

We propose a new random access protocol based on reservation ALOHA (R-ALOHA), called ANC-ALOHA, for applying analog network coding (ANC) to the slotted ALOHA channel of satellite networks (SATNETs). Although ANC promises excellent performance in SATNETs, ANC is not guaranteed in slotted ALOHA owing to the inherent randomness. R-ALOHA can be used to acquire a slot for ANC, but there are still two remaining problems to be overcome. First, the reservation maintenance of R-ALOHA does not work for ANC owing to the superposed signals. Second, a channel estimation scheme for ANC is needed in a slotted ALOHA channel. ANC-ALOHA exploits a keep-on sequence as the preamble and postamble of a burst for ANC to solve the above issues. The reduced payload size and delayed transmission are also proposed to assure the reception of the keep-on sequence. We derived an analytic model to verify the throughput of ANC-ALOHA, and validated it based on the simulation results. The results indicate that ANC-ALOHA significantly improves the channel throughput compared to R-ALOHA.

关键词： analog network coding random access protocols satellite networks slotted ALOHA

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Outage Analysis of Non-Regenerative analog network coding for Two-Way Multi-Hop networks

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IEEE COMMUNICATIONS LETTERS 2011年第6期15卷 662-664页

作者： Wang, Gengkun Xiang, Wei Yuan, Jinhong Huang, Tao Univ So Queensland Fac Engn & Surveying Toowoomba Qld 4350 Australia Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

We investigate the performance of analog network coding (ANC) for multi-hop networks in this letter. With the amplify-and-forward (AF) protocol, relays broadcast the sum of two colliding signals to neighboring nodes, while the source node can subtract its own signal from the colliding signals to obtain the received information. We first give the transmission scheme expressions for the n-node m-frame two-way multi-hop network. For this scheme, we derive the end-to-end signal-to-noise ratio (SNR) expression. The closed-form expression of the outage probability for the generalized multi-hop network is evaluated. Numerical results demonstrate that the outage performance with ANC is better than that of the traditional AF scheme.

关键词： Multi-hop networks analog network coding end-to-end SNR outage probability

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Performance analysis of amplify-and-forward cooperative diversity with multiple-antenna nodes via analog network coding

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Journal of Harbin Institute of Technology(New Series) 2012年第6期19卷 13-16页

作者：杨洪娟孟维晓李博 Communication Research Center Harbin Institute of Technology

network coding (NC), which works in the network layer, is an effective technology to improve the network throughput, by allowing the relay to encode the information from different users and ensuring the destination to retrieve the desired information. Employing network coding technique in a cooperative network can improve the network performance further. In this paper, we introduce analog network coding (ANC) to a simple two-user cooperative diversity network, which adopts amplify-and-forward (AF) mode and all nodes use multiple antennas. The impact of the number of antenna on the system achievable rate is investigated. And the bit error rate (BER) performances of the traditional relay cooperative network and the cooperative network based on analog network coding under different propagation conditions are discussed. The simulation results show that the performance of the traditional cooperative network has improved significantly due to the employ of network coding.

关键词： cooperative diversity amplify-and-forward multiple antennas network coding analog network coding

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Is analog network coding More Energy Efficient than TDMA? 19

Is Analog Network Coding More Energy Efficient than TDMA?

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19th IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and networks (CAMAD)

作者： Ntontin, Konstantinos Di Renzo, Marco Perez-Neira, Ana Verikoukis, Christos Telecommun Technol Ctr Catalonia CTTC Castelldefels Spain Univ Paris 11 French Natl Ctr Sci Res CNRS Ecole Super Elect SUPELEC CNRSUMR 8506L2SSUPELEC F-91192 Paris France

ISBN: (纸本)9781479957255

In this paper, we investigate the possibility, from an energy efficiency point of view, of employing analog network coding in the Multiple Access Relay Channel (MARC) instead of the conventional Time-Division Multiple Access (TDMA) protocol when time and not bandwidth is the available resource in the network. Towards this end, we derive a closed-form upper bound of the Bit Error Rate (BER) per source of analog network coding when the optimal maximum-likelihood (ML) detector is employed. Based on this framework, we mathematically prove that as either the number of sources or the number of relays or the modulation order increases, the possibility of analog network coding being more energy efficient than TDMA increases as well. These findings are substantiated by means of Monte Carlo simulations.

关键词： Monte Carlo methods channel coding error statistics mathematical analysis maximum likelihood detection network coding relay networks (telecommunication) telecommunication network reliability time division multiple access wireless channels BER MARC Monte Carlo simulation TDMA protocol analog network coding bit error rate closed-form upper bound energy efficiency modulation multiple access relay channel optimal ML detector optimal maximum-likelihood detector time-division multiple access time-division multiple access protocol Bit error rate Modulation network coding Relays Time division multiple access Vectors Wireless communication

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Channel Capacity of analog network coding in a Wireless Channel

Channel Capacity of Analog Network Coding in a Wireless Chan...

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20th IEEE Symposium on Personal, Indoor and Mobile Radio Communications

作者： Gacanin, Haris Adachi, Fumiyuki Tohoku Univ Grad Sch Engn Dept Elect & Commun Engn Sendai Miyagi 980 Japan

ISBN: (纸本)9781424451234

Radio channel is characterized by a mutlipath propagation that is suitable for application of network coding (NC) to improve the network capacity. In particular, physical layer networking coding (PNC) scheme is known to double the network capacity of bi-directional communication between pairs of end users assisted by a relay terminal in a Gaussian channel. Recently, analog network coding (ANC) has been proposed with a simpler implementation complexity in comparison with PNC scheme, but the same achievable network capacity. On the other hand, an important question is how much the channel capacity is improved over a conventional point-to-point communication in a frequency-selective fading channel. In this paper, we present the ergodic channel capacity analysis of bi-directional transmission with analog network coding in a frequency-selective fading channel. The channel capacity expression for transmission with frequency domain equalization (FDE) is derived based on the Gaussian approximation of the inter-symbol interference (ISI) after FDE.

关键词： analog network coding channel capacity multipath fading

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Novel MMSE Design for Joint MIMO Processing in analog network coding Schemes

Novel MMSE Design for Joint MIMO Processing in Analog Networ...

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4th International Conference on Signal Processing and Communication Systems (ICSPCS)/12th International Symposium on DSP and Communication Systems (DSPCS)/9th Workshop on the Internet, Telecommunications and Signal Processing (WTSP)

作者： Lu, Enoch Li, Jialing Lu, I-Tai NYU Polytech Inst Dept ECE Metrotech Ctr 6 Brooklyn NY 11201 USA

ISBN: (纸本)9781424479078

A novel generalized iterative approach (GIA) is proposed for jointly designing the MMSE MIMO processors (precoders, relay processors and decoders) for the analog network coding scheme. The MMSE performance can be achieved for MIMO communication links with two end nodes and multiple relay nodes subject to either the per-node power constraint or the practical per-antenna power constraint. Numerical results show that the analog network coding scheme is more spectral and energy efficient than the conventional Direct Transmission (DT) scheme.

关键词： analog network coding Joint MMSE MIMO per-antenna power constraint

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Performance Bounds for analog network coding Based Two-Way Relaying with Multiuser Selection Diversity

Performance Bounds for Analog Network Coding Based Two-Way R...

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Upadhyay, Prabhat K. Prakriya, Shankar Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

ISBN: (纸本)9781612842547

This paper evaluates the performance of an opportunistic scheduling scheme for a multiuser two-way relay network, wherein an analog network coding (ANC)-based relay assists the communication between multiple pairs of users. To ensure fairness for each user pair, we consider a scheduler based on maximizing the normalized minimum of the instantaneous signal-to-noise ratios (SNRs) at each user of the pair. Under a high SNR assumption, we derive upper and lower bound expressions for the outage probability and the average sum-rate in a Rayleigh fading environment and establish that a multiuser diversity of order equal to the number of user pairs is harnessed by the scheme. Numerical and simulation results are presented to confirm the performance gain of the proposed scheme.

关键词： network coding Protocols Rayleigh channels Rayleigh channels Rayleigh fading environment Relays Signal to noise ratio Simulation analog network coding diversity reception instantaneous signal-to-noise ratios multiple user pairs multiuser channels multiuser selection diversity multiuser two-way relay network network coding opportunistic scheduling outage probability scheduling telecommunication network reliability telecommunication network routing

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Differential Bi-Directional Relay Selection Using analog network coding

Differential Bi-Directional Relay Selection Using Analog Net...

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Song, Lingyang Li, Yonghui Guo, Hong Jiao, Bingli Wei, Xusheng Peking Univ Beijing Peoples R China Univ Sydney Sydney NSW 2006 Australia Inst Appl Phys & Computat Math Beijing Peoples R China Res Motion Slough Berks England

ISBN: (纸本)9781424463985

In this paper, we consider a general bi-directional relay network with two sources and N relays when neither the source nodes nor the relays know the channel state information (CSI). A bi-directional relay selection scheme is proposed using differential analog network coding (BRS-DANC), and a simple linear detector is given to recover the received signals. In the proposed scheme, we provide an optimal and a sub-optimal methods to select the relay node from a single source by minimizing the average symbol error rate (SER). The performance of the proposed BRS-DANC scheme is analyzed, and a simple asymptotic SER expression is derived. It is shown that the SER performance of the proposed differential scheme is about 3 dB away from that of the coherent detection scheme.

关键词： Differential modulation bi-directional relaying analog network coding amplify-and-forward protocol

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